They still hoped to find their missing son.

　　他們仍然希望找到他們丟失的兒子。

　　They have been missing for a long time now.

　　到現在他們已經(jīng)失蹤很長(cháng)時(shí)間了。

　　Three sailors are missing, believed drowned.

　　有三位船員失蹤。相信是淹死了。